CVE-2025-10838
BaseFortify
Publication date: 2025-09-23
Last updated on: 2025-10-03
Assigner: VulDB
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| tenda | ac21_firmware | to 16.03.08.16 (inc) |
| tenda | ac21 | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-119 | The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
| CWE-120 | The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2025-10838 is a buffer overflow vulnerability in the Tenda AC21 router firmware version 16.03.08.16. It occurs in the function sub_45BB10 within the /goform/WifiExtraSet endpoint when the argument 'wpapsk_crypto' is manipulated. The vulnerability arises because the product copies an input buffer to an output buffer without verifying that the input size fits, leading to a stack-based buffer overflow. This flaw can be exploited remotely by sending a specially crafted HTTP POST request, potentially causing denial of service or remote code execution. [1, 2]
How can this vulnerability impact me? :
This vulnerability can impact you by compromising the confidentiality, integrity, and availability of the affected Tenda AC21 router. An attacker can remotely exploit the buffer overflow to cause denial of service (DoS) or execute arbitrary code on the device. This could lead to unauthorized control over the router, disruption of network services, and potential further attacks on connected systems. The exploit is publicly available and easy to execute, with no known mitigations currently. [1, 2]
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by monitoring for specially crafted HTTP POST requests to the endpoint /goform/WifiExtraSet that manipulate the wpapsk_crypto parameter. Network intrusion detection systems (NIDS) can be configured to alert on such suspicious POST requests. Additionally, inspecting HTTP traffic for unusual or oversized wpapsk_crypto parameter values may help identify exploitation attempts. Specific commands would depend on the tools in use, but for example, using curl to test the endpoint with crafted payloads or using tcpdump/wireshark to capture and analyze HTTP POST requests targeting /goform/WifiExtraSet could be effective. [1, 2]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include replacing the affected Tenda AC21 router firmware version 16.03.08.16 with a patched or updated version if available. Since no known countermeasures or mitigations currently exist, it is recommended to isolate the vulnerable device from untrusted networks to prevent remote exploitation. Network administrators should also monitor for exploit attempts and consider disabling remote management features if possible. Applying network-level protections such as firewall rules to block access to the /goform/WifiExtraSet endpoint can reduce exposure. [2]